Princess Charlotte and Prince George joined the Christmas Day service in Sandringham for the first time. As the Cambridges' only daughter walk hand-in-hand with her mom, Kate Middleton, the 4-year-old royal copied the way her mother curtsied to Queen Elizabeth II, and everyone found it sweet and cute.

It has been the royal family's tradition to walk to a local church in Sandringham. The Cambridge kids also walked the short distance from Sandringham House to St Mary Magdalene Church as they made their Christmas walk debut. However, the 1-year-old Prince Louis was left in the house.

Prince George and Princess Charlotte were alongside their parents and displayed their best behavior as they met the crowd. They even greeted and hugged some people, who were waiting for the royals to give their presents, per Harper's Bazaar.

Although this alone was a sweet gesture from the kids, Princess Charlotte's way of mimicking Kate Middleton's curtsy was far more lovable. When the royals left the church, the Duchess of Cambridge curtsied to Queen Elizabeth.

Although her mother didn't ask her to do the same, Princess Charlotte willingly copied how her mother made the move. She held the side of her coat and did the royal curtsy. It was caught on camera and now going viral online.

A lot of people praised what Princess Charlotte did. One fan said that she did it like a real princess, while others repeatedly called what she did the "cutest thing ever." Others added it was an adorable thing for her to do, while some continued to say that it was a "polite curtsy" to Queen Elizabeth that she did with grace.

Another one mentioned that there is no lack in manners to Her Majesty, and Kate Middleton and Prince William raised their kids "very polite," and it showed at the event. One follower even noticed that Princess Charlotte offered her hand to the minister to shake as they left the church grounds after her mother did the same.

Meanwhile, Daily Mail Online noted that other royals who attended the Christmas Day service were Princess Beatrice and her fiancé, Edoardo Mapelli Mozzi. Of course, Queen Elizabeth was there, wearing a matching red coat and hat. She arrived at the church in a maroon Bentley with Camilla, Duchess of Cornwall.

Prince Philip, on the other hand, didn't make it to the event. The Duke of Edinburgh was just recently out from the hospital on Christmas Eve due to a "pre-existing condition."He stayed at Sandringham after spending four nights at the King Edward VII Hospital in London for treatments.